/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.zxing.view;

import java.util.Collection;
import java.util.HashSet;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.NinePatchDrawable;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.View;

import com.ciwong.libs.utils.DeviceUtils;
import com.ciwong.mobilelib.R;
import com.google.zxing.ResultPoint;
import com.zxing.camera.CameraManager;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder
 * rectangle and partial transparency outside it, as well as the laser scanner
 * animation and result points.
 */
public final class ViewfinderView extends View {

    private static final int[] SCANNER_ALPHA = {0, 64, 128, 192, 255, 192, 128,
            64};

    private static final long ANIMATION_DELAY = 20L;

    private static final int OPAQUE = 0xFF;

    private final Paint paint;

    private Bitmap resultBitmap;

    private final int maskColor;

    private final int resultColor;

    private final int frameColor;

    private final int laserColor;

    private final int resultPointColor;

    private int scannerAlpha;

    private Collection<ResultPoint> possibleResultPoints;

    private Collection<ResultPoint> lastPossibleResultPoints;

    private boolean isFirst;

    /**
     */
    private int slideTop;

    /**
     */
    private int slideBottom;

    /**
     */
    private static final int SPEEN_DISTANCE = 5;

    /**
     */
    private static final int MIDDLE_LINE_WIDTH = 6;

    /**
     */
    private static final int MIDDLE_LINE_PADDING = 5;

    /**
     */
    private static final int CORNER_WIDTH = 10;

    /**
     */
    private int ScreenRate;

    private Bitmap lineBit;

    private String frameTextColor = "#9ea09c";

    private static float density;

    boolean isAnimation = true;

    private String bottomText = "";

    private String topText = "";

    // This constructor is used when the class is built from an XML resource.
    public ViewfinderView(Context context, AttributeSet attrs) {
        super(context, attrs);

        density = context.getResources().getDisplayMetrics().density;
        ScreenRate = (int) (20 * density);

        // Initialize these once for performance rather than calling them every
        // time in onDraw().
        paint = new Paint();
        Resources resources = getResources();
        maskColor = resources.getColor(R.color.viewfinder_mask);
        resultColor = resources.getColor(R.color.result_view);
        frameColor = resources.getColor(R.color.viewfinder_frame);
        laserColor = resources.getColor(R.color.viewfinder_laser);
        resultPointColor = resources.getColor(R.color.possible_result_points);
        scannerAlpha = 0;
        possibleResultPoints = new HashSet<ResultPoint>(5);
        lineBit = BitmapFactory.decodeResource(resources, R.mipmap.scan_line);
    }

    public void setTopText(String text) {
        topText = text;
    }

    @Override
    public void onDraw(Canvas canvas) {
        Rect frame = CameraManager.get().getFramingRect();
        int textHeight = CameraManager.get().getTextHeight();
        if (frame == null) {
            return;
        }

        if (!isFirst) {
            isFirst = true;
            slideTop = frame.top;
            slideBottom = frame.bottom;
        }

        int width = canvas.getWidth();
        int height = canvas.getHeight();

        // Draw the exterior (i.e. outside the framing rect) darkened
        paint.setColor(resultBitmap != null ? resultColor : maskColor);
        canvas.drawRect(0, 0, width, frame.top, paint);
        canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
        canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,
                paint);
        canvas.drawRect(0, frame.bottom + 1, width, height, paint);

        if (resultBitmap != null) {
            // Draw the opaque result bitmap over the scanning rectangle
            paint.setAlpha(OPAQUE);
            canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
        } else {
            // Draw a two pixel solid black border inside the framing rect
            paint.setColor(frameColor);
            canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,
                    frame.top + CORNER_WIDTH, paint);
            canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH,
                    frame.top + ScreenRate, paint);
            canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,
                    frame.top + CORNER_WIDTH, paint);
            canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right,
                    frame.top + ScreenRate, paint);
            canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left
                    + ScreenRate, frame.bottom, paint);
            canvas.drawRect(frame.left, frame.bottom - ScreenRate, frame.left
                    + CORNER_WIDTH, frame.bottom, paint);
            canvas.drawRect(frame.right - ScreenRate, frame.bottom
                    - CORNER_WIDTH, frame.right, frame.bottom, paint);
            canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom
                    - ScreenRate, frame.right, frame.bottom, paint);
            // xie zi
            if (!TextUtils.isEmpty(bottomText)) {
                paint.setTextAlign(Paint.Align.CENTER);
                paint.setTextSize(DeviceUtils.sp2px(14));
                paint.setColor(Color.parseColor(frameTextColor));
                Rect targetRect = /*
                                   * new Rect(frame.left, frame.bottom,
                                   * frame.right, frame.bottom + textHeight);
                                   */frame;
                Paint.FontMetricsInt fontMetrics = paint.getFontMetricsInt();
                int baseline = targetRect.top
                        + (targetRect.bottom - targetRect.top
                        - fontMetrics.bottom + fontMetrics.top) / 2
                        - fontMetrics.top;
                canvas.drawText(bottomText, targetRect.centerX(), baseline,
                        paint);
            }


        }

        if (isAnimation) {
            slideTop += SPEEN_DISTANCE;
            if (slideTop >= frame.bottom) {
                slideTop = frame.top;
            }
            canvas.drawBitmap(lineBit, new Rect(0, 0, lineBit.getWidth(),
                    lineBit.getHeight()), new Rect(frame.left
                    + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH / 2,
                    frame.right - MIDDLE_LINE_PADDING, slideTop
                    + MIDDLE_LINE_WIDTH / 2), paint);
            postInvalidateDelayed(ANIMATION_DELAY);
        }
        paint.setColor(frameColor);
    }

    /**
     * 开始扫描动画
     */
    public void startScanAnim() {
        if (!isAnimation) {
            isAnimation = true;
            updateLineTop();
            postInvalidate();
        }
    }

    /**
     * 停止扫描动画
     */
    public void stopScanAnim() {
        isAnimation = false;
        postInvalidate();
    }

    public void setText(String str) {
        this.bottomText = str;
    }

    public void updateLineTop() {
        try {

            slideTop = CameraManager.get().getFramingRect().top;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void drawViewfinder() {
        resultBitmap = null;
        invalidate();
    }

    /**
     * Draw a bitmap with the result points highlighted instead of the live
     * scanning display.
     *
     * @param barcode An image of the decoded barcode.
     */
    public void drawResultBitmap(Bitmap barcode) {
        resultBitmap = barcode;
        invalidate();
    }

    public void addPossibleResultPoint(ResultPoint point) {
        possibleResultPoints.add(point);
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (lineBit != null && !lineBit.isRecycled()) {
            lineBit.recycle();
            lineBit = null;
        }
    }

    @Override
    protected void onAttachedToWindow() {
        super.onAttachedToWindow();
    }
}
